Datasheet > ADM1088AKSZ-REEL7

ADM1088AKSZ-REEL7

更新时间： 2024-11-07 12:33:19

品牌	Logo	应用领域
亚德诺 - ADI		/
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16页	299K
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Simple Sequencers in 6-Lead SC7

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Simple Sequencers^®in 6-Lead SC70

ADM1085/ADM1086/ADM1087/ADM1088

FEATURES

FUNCTIONAL BLOCK DIAGRAMS

Provide programmable time delays between enable

signals

Can be cascaded with power modules for multiple

supply sequencing

Power supply monitoring from 0.6 V

Output stages

ADM1085/ADM1086

CAPACITOR

ADJUSTABLE

DELAY

ENOUT

0.6V

High voltage (up to 22 V) open-drain output

(ADM1085/ADM1087)

Push-pull output (ADM1086/ADM1088)

GND

CEXT

ENIN

Capacitor-adjustable time delays

High voltage (up to 22 V) enable and V_INinputs

Low power consumption (15 μA)

Specified over –40°C to +125°C temperature range

6-lead SC70 package

ADM1087/ADM1088

CAPACITOR

ADJUSTABLE

DELAY

ENOUT

0.6V

APPLICATIONS

Desktop/notebook computers, servers

Low power portable equipment

Routers

GND

CEXT

ENIN

Figure 1.

Base stations

Line cards

Graphics cards

GENERAL DESCRIPTION

The ADM1085/ADM1086/ADM1087/ADM1088 are simple

sequencing circuits that provide a time delay between the

enabling of voltage regulators and/or dc-dc converters at power-

up in multiple supply systems. When the output voltage of the

first power module reaches a preset threshold, a time delay is

initiated before an enable signal allows subsequent regulators to

power up. Any number of these devices can be cascaded with

regulators to allow sequencing of multiple power supplies.

All four models have a dedicated enable input pin that allows

the output signal to the regulator to be controlled externally.

This is an active high input (ENIN) for the ADM1085 and

ADM1086, and an active low input (

) for the ADM1087

ENIN

and ADM1088.

The Simple Sequencers are specified over the extended

−40°C to +125°C temperature range. With low current

consumption of 15 μA (typical) and 6-lead SC70 packaging,

the parts are suitable for low-power portable applications.

Threshold levels can be set with a pair of external resistors in a

voltage divider configuration. With appropriate resistor values,

the threshold can be adjusted to monitor voltages as low as 0.6 V.

Table 1. Selection Table

Output Stage

Part No.

Enable Input ENOUT

ENOUT

The ADM1086 and ADM1088 have push-pull output stages,

with active high (ENOUT) and active low (

) logic

ADM1085

ENIN

Open-drain

ENOUT

outputs, respectively. The ADM1085 has an active-high

(ENOUT) logic output; the ADM1087 has an active-low

ADM1086

ADM1087

ADM1088

ENIN

Push-pull

(

) output. Both the ADM1085 and ADM1087 have

ENOUT

ENIN

Open-drain

Push-pull

open-drain output stages that can be pulled up to voltage levels

as high as 22 V through an external resistor. This level-shifting

property ensures compatibility with enable input logic levels of

different regulators and converters.

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registeredtrademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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